Angus didn't know the Yenisey River existed until he came across its name in a book while researching another trip. The Yenisey, he learned, is the world's fifth-longest river, flowing 5,500 kilometers (3,300 miles) from western Mongolia to the Arctic Circle, and had never been run from source to sea. That kind of challenge proved irresistible to the Canadian adventurer. In short order, Angus (Amazon Extreme) cobbled together three companions and (barely) enough sponsorship dollars to keep them afloat, and in spring 2001 set off for Mongolia. The quartet paddled through territory covered by few travelers and even fewer writers. They dealt with financial difficulties, freezing temperatures, a kayak-swallowing maelstrom and more. The book is nearly a blow-by-blow account of the harrowing five-month journey, with trivial events reproduced as faithfully as extraordinary ones. Some sections read as though they were plucked unedited from Angus's journal (e.g., after mentioning fresh milk in one entry, he concludes, "The remaining liter of milk turned into yogurt overnight. I guess with unpasteurized milk, you don't need to stimulate the process. Still, it tasted great"). The characters Angus meets along the way—a kindly Mongolian army officer; a Russian mafia boss; and the indigenous people of the Arctic—are tantalizing, but Angus doesn't linger on them or on the three young men he's traveling with. Some readers may wish Angus had something more to say, in the end, than "we did it." Still, his book should please readers looking for a straightforward, uncomplicated adventure tale. Photos. (On sale Sept. 9)